Abstract Increasing the efficiency and power generation capacity of power plants is an important issue that has attracted the attention of many researchers in recent years. Beside the designing and constructing new combined cycles to provide the human electrical demand load, extending the existing power plants is very important due to saving time, cost and place of installation and so on. This study suggests various combined cycles to develop a common 250 MW steam power plant which is located in the Ghazvin city to increase its efficiency and production capacity by coupling with gas turbine, absorption chiller, photovoltaic (PV) and photovoltaic-thermal (PVT) in various arrangements. In order to estimate the operation of the suggested power plants, hourly thermo-economic analysis is done in engineering equation solver software (EES). By calculating an accurate hourly schedule which determines the times in which the power plant should shift from one source to another, the highest efficiency of the combined cycles is obtained. The results showed that the efficiency and the power generated by all proposed combined cycles in the present study increased significantly. Additionally it was found, increasing the number of solar panels decreased the power generation cost and the effect of this increment on the cycle extended by PVT was more than other combined cycles so that with the increasing the number of solar panels up to 25,000, the cost of power generated per kWh in PVT based cycle reduced to 4.51 $/kWh that was the lowest cost among the suggested combined cycles.

中文翻译：

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采用燃气轮机、光伏、光伏/热能和吸收式冷水机组的 250 MW 蒸汽发电厂的开发和热经济分析

摘要 提高发电厂的效率和发电能力是近年来引起众多研究人员关注的重要问题。除了设计和建造新的联合循环来提供人类电力需求负荷外，由于节省时间、成本和安装地点等原因，扩展现有发电厂非常重要。本研究建议采用各种联合循环来开发位于 Ghazvin 市的普通 250 MW 蒸汽发电厂，通过与燃气轮机、吸收式制冷机、光伏 (PV) 和光伏热 (PVT) 耦合来提高其效率和生产能力。各种安排。为了估计建议发电厂的运行，在工程方程求解器软件 (EES) 中进行每小时热经济分析。通过计算精确的每小时计划，该计划决定了发电厂应该从一个源转移到另一个源的时间，从而获得联合循环的最高效率。结果表明，本研究中所有提议的联合循环产生的效率和功率显着增加。此外还发现，增加太阳能电池板数量降低了发电成本，并且这种增加对PVT延长周期的影响大于其他联合循环，因此随着太阳能电池板数量增加到25,000，成本在基于 PVT 的循环中每千瓦时产生的电力减少到 4.51 美元/千瓦时，这是建议的联合循环中的最低成本。